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| Titel |
Tsunami damping by mangrove forest: a laboratory study using parameterized trees |
| VerfasserIn |
A. Strusińska-Correia, S. Husrin, H. Oumeraci |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 2 ; Nr. 13, no. 2 (2013-02-25), S.483-503 |
| Datensatznummer |
250018374
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| Publikation (Nr.) |
 copernicus.org/nhess-13-483-2013.pdf |
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| Zusammenfassung |
| Tsunami attenuation by coastal vegetation was examined under laboratory
conditions for mature mangroves Rhizophora sp. The developed novel tree parameterization
concept, accounting for both bio-mechanical and structural tree properties,
allowed to substitute the complex tree structure by a simplified tree model
of identical hydraulic resistance. The most representative parameterized
mangrove model was selected among the tested models with different frontal
area and root density, based on hydraulic test results. The selected
parameterized tree models were arranged in a forest model of different width
and further tested systematically under varying incident tsunami conditions
(solitary waves and tsunami bores). The damping performance of the forest
models under these two flow regimes was compared in terms of wave height and
force envelopes, wave transmission coefficient as well as drag and inertia
coefficients. Unlike the previous studies, the results indicate a
significant contribution of the foreshore topography to solitary wave energy
reduction through wave breaking in comparison to that attributed to the
forest itself. A similar rate of tsunami transmission (ca. 20%) was
achieved for both flow conditions (solitary waves and tsunami bores) and the
widest forest (75 m in prototype) investigated. Drag coefficient CD
attributed to the solitary waves tends to be constant (CD = 1.5) over
the investigated range of the Reynolds number. |
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